Beamsplitters separate the light between two arms. The red and
blue cameras may be operated simultaneously, and together they may
acquire spectra covering a 3200-10,000 Angstroms wavelength range.

The field of view in both modes of operation is 6×7.8
arcmin. The red camera uses a mosaic of two LBNL 2k x 4k fully
depleted, high resistivity CCD detectors
with a pixel scale of 0.135 "/pixel.
The blue camera has a mosaic of 2 2Kx4K Marconi CCDs and the pixel scale is 0.135 "/pixel.
The standard imaging filters include the UBVGRI passbands plus a small number of narrowband imaging filters.

Spectroscopy can be performed using a standard complement of longslits of various widths, or in multi-object
mode, by using designed slitmasks which are milled on-site. An assortment of gratings (red side) and grisms (blue side)
yield resolutions ranging from R=300-5,000, with peak system efficiencies of ~50%.

An optional polarimeter module enables spectropolarimetry.

Click on the map to go to the specific specs pages

Below is an example MOS data product. The image on the left is of a
globular cluster. Red rectangles mark the location of the slits for
the designed mask. The spectra on the right is the data product output
from LRIS. Within each spectra there are verticle lines where the
night sky is bright and a horizontal line that is the objects
spectrum. The dashed line is the imaging FOV of the LRIS Red Detector.